/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright held by original author
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
    Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM; if not, write to the Free Software Foundation,
    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Description
    
\*---------------------------------------------------------------------------*/

#include "contactPatchPair.H"
#include "volPointInterpolation.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

void contactPatchPair::updateContact
(
    const volVectorField& disp
)
{
    vectorField slaveVertexResult =
        patchToPatchInterpolate_.pointInterpolate<vector>
        (
            masterInterpolate_.faceToPointInterpolate
            (
                disp.boundaryField()[masterPatchIndex_]
            )
        );

    const vectorField& projectionDirection =
        mesh_.boundaryMesh()[slavePatchIndex_].pointNormals();

    // use this for touch fraction
    scalarField vertexSlaveGap =
    (
        (
            slaveVertexResult
          - slaveInterpolate_.faceToPointInterpolate
            (
                disp.boundaryField()[slavePatchIndex_]
            )
        )
        & projectionDirection
    ) + patchToPatchInterpolate_.pointDistanceToIntersection() - tol_;

    // use this for slaveDisplacement
    vectorField vertexSlaveDisplacement =
        slaveVertexResult
      + patchToPatchInterpolate_.pointDistanceToIntersection()
        *projectionDirection;

    // calculate area in contact

    const faceList& slavePatchLocalFaces =
        mesh_.boundaryMesh()[slavePatchIndex_].localFaces();

    const pointField& slavePatchLocalPoints =
        mesh_.boundaryMesh()[slavePatchIndex_].localPoints();

    touchFraction_ = 0;

    forAll (slavePatchLocalFaces, faceI)
    {
        touchFraction_[faceI] =
            slavePatchLocalFaces[faceI].areaInContact
            (
                slavePatchLocalPoints,
                vertexSlaveGap
            );
    }

    // calculate contact direction
    slaveDisplacement_ =
        slaveInterpolate_.pointToFaceInterpolate(vertexSlaveDisplacement);
}


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// ************************************************************************* //